all: Fix various user-facing and non-user-facing typos (#8509)

Found via `codespell -q 3 -S lang,./gui/default/vendor -L benchs,bu,inflight,ro`

lib/model/folder_sendrecv.go

@@ -503,7 +503,7 @@ nextFile:
 		devices := snap.Availability(fileName)
 		for _, dev := range devices {
 			if _, ok := f.model.Connection(dev); ok {
-				// Handle the file normally, by coping and pulling, etc.
+				// Handle the file normally, by copying and pulling, etc.
 				f.handleFile(fi, snap, copyChan)
 				continue nextFile
 			}
@@ -1877,7 +1877,7 @@ func (f *sendReceiveFolder) newPullError(path string, err error) {
 
 	// Establish context to differentiate from errors while scanning.
 	// Use "syncing" as opposed to "pulling" as the latter might be used
-	// for errors occurring specificly in the puller routine.
+	// for errors occurring specifically in the puller routine.
 	errStr := fmt.Sprintln("syncing:", err)
 	f.tempPullErrors[path] = errStr
 

lib/model/model.go

@@ -1433,7 +1433,7 @@ func (m *model) ccCheckEncryption(fcfg config.FolderConfiguration, folderDevice
 	}
 
 	if !(hasTokenRemote || hasTokenLocal || isEncryptedRemote || isEncryptedLocal) {
-		// Noone cares about encryption here
+		// No one cares about encryption here
 		return nil
 	}
 
@@ -1515,7 +1515,7 @@ func (m *model) ccCheckEncryption(fcfg config.FolderConfiguration, folderDevice
 			m.fmut.Lock()
 			m.folderEncryptionPasswordTokens[fcfg.ID] = ccToken
 			m.fmut.Unlock()
-			// We can only announce ourselfs once we have the token,
+			// We can only announce ourselves once we have the token,
 			// thus we need to resend CCs now that we have it.
 			m.sendClusterConfig(fcfg.DeviceIDs())
 			return nil

lib/model/requests_test.go

@@ -1174,7 +1174,7 @@ func TestRequestIndexSenderPause(t *testing.T) {
 	var seq int64 = 1
 	files := []protocol.FileInfo{{Name: "foo", Size: 10, Version: protocol.Vector{}.Update(myID.Short()), Sequence: seq}}
 
-	// Both devices connected, noone paused
+	// Both devices connected, none paused
 	localIndexUpdate(m, fcfg.ID, files)
 	select {
 	case <-time.After(5 * time.Second):

lib/model/sentdownloadstate.go

@@ -78,7 +78,7 @@ func (s *sentFolderDownloadState) update(pullers []*sharedPullerState) []protoco
 		}
 
 		if !pullerVersion.Equal(localFile.version) || !pullerCreated.Equal(localFile.created) {
-			// The version has changed or the puller was reconstrcuted due to failure.
+			// The version has changed or the puller was reconstructed due to failure.
 			// Clean up whatever we had for the old file, and advertise the new file.
 			updates = append(updates,
 				protocol.FileDownloadProgressUpdate{